﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;

namespace WebApplicationBack
{
    public class FTPOperation
    {

        string ftpServerIP;
        string ftpUserID;
        string ftpPassword;
        FtpWebRequest reqFTP;

        private void Connect(String path)//连接ftp
        {
            // 根据uri创建FtpWebRequest对象
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));

            // 指定数据传输类型
            reqFTP.UseBinary = true;

            // ftp用户名和密码
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
        }

        public FTPOperation(string ftpServerIP, string ftpUserID, string ftpPassword)
        {
            this.ftpServerIP = ftpServerIP;
            this.ftpUserID = ftpUserID;
            this.ftpPassword = ftpPassword;
        }

        //都调用这个
        private string[] GetFileList(string path, string WRMethods)//下面的代码示例了如何从ftp服务器上获得文件列表
        {
            string[] downloadFiles;
            StringBuilder result = new StringBuilder();
            try
            {
                Connect(path);
                reqFTP.Method = WRMethods;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default);//中文文件名
                string line = reader.ReadLine();
                while (line != null)
                {
                    result.Append(line);
                    result.Append(" ");
                    line = reader.ReadLine();
                }

                // to remove the trailing '' ''
                result.Remove(result.ToString().LastIndexOf(""), 1);
                reader.Close();
                response.Close();
                //char[] seperator={'\n'};
                return result.ToString().Split(' ');
            }
            catch (Exception ex)
            {
                //System.Windows.Forms.MessageBox.Show(ex.Message);
                downloadFiles = null;
                return downloadFiles;
            }
        }

        public string[] GetFileList(string path)//下面的代码示例了如何从ftp服务器上获得文件列表
        {
            return GetFileList("ftp://" + ftpServerIP + "/" + path, WebRequestMethods.Ftp.ListDirectory);
        }

        public string[] GetFileList()//下面的代码示例了如何从ftp服务器上获得文件列表
        {
            return GetFileList("ftp://" + ftpServerIP + "/", WebRequestMethods.Ftp.ListDirectory);
        }

        public void Upload(string filename, string foldername) //下面的代码实现了从ftp服务器上载文件的功能
        {

            FileInfo fileInf = new FileInfo(filename);
            string uri = "ftp://" + ftpServerIP + "/" + foldername + "/" + filename.Substring(filename.LastIndexOf("\\") + 1);
            Connect(uri);//连接
            // 默认为true，连接不会被关闭
            // 在一个命令之后被执行

            reqFTP.KeepAlive = false;

            // 指定执行什么命令
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

            // 上传文件时通知服务器文件的大小
            reqFTP.ContentLength = fileInf.Length;

            // 缓冲大小设置为kb
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;

            // 打开一个文件流(System.IO.FileStream) 去读上传的文件
            FileStream fs = fileInf.OpenRead();
            try
            {
                // 把上传的文件写入流
                Stream strm = reqFTP.GetRequestStream();

                // 每次读文件流的kb
                contentLen = fs.Read(buff, 0, buffLength);

                // 流内容没有结束
                while (contentLen != 0)
                {
                    // 把内容从file stream 写入upload stream
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }

                // 关闭两个流
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message, "Upload Error");
            }
        }

        public bool Download(string filePath, string fileName, out string errorinfo)/**/////下面的代码实现了从ftp服务器下载文件的功能
        {
            try
            {
                String onlyFileName = Path.GetFileName(fileName);
                string newFileName = filePath + "\\" + onlyFileName;
                if (File.Exists(newFileName))
                {
                    errorinfo = string.Format("本地文件{0}已存在,无法下载", newFileName);
                    return false;
                }

                string url = "ftp://" + ftpServerIP + "/" + fileName;
                Connect(url);//连接
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                FileStream outputStream = new FileStream(newFileName, FileMode.Create);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }

                ftpStream.Close();
                outputStream.Close();
                response.Close();
                errorinfo = "";
                return true;
            }
            catch (Exception ex)
            {
                errorinfo = string.Format("因{0},无法下载", ex.Message);
                return false;
            }
        }

        //删除文件
        public void DeleteFileName(string fileName)
        {
            try
            {
                FileInfo fileInf = new FileInfo(fileName);
                string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
                Connect(uri);//连接 

                // 默认为true，连接不会被关闭
                // 在一个命令之后被执行
                reqFTP.KeepAlive = false;

                // 指定执行什么命令
                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message, "删除错误");
            }
        }

        //创建目录
        public void MakeDir(string dirName)
        {
            try
            {
                string uri = "ftp://" + ftpServerIP + "/" + dirName;
                Connect(uri);//连接
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message);
            }
        }

        //删除目录
        public void delDir(string dirName)
        {
            try
            {
                string uri = "ftp://" + ftpServerIP + "/" + dirName;
                Connect(uri);//连接
                reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message);
            }
        }

        //获得文件大小
        public long GetFileSize(string filename)
        {
            long fileSize = 0;
            try
            {
                FileInfo fileInf = new FileInfo(filename);
                string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
                Connect(uri);//连接
                reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                fileSize = response.ContentLength;
                response.Close();
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message);
            }
            return fileSize;
        }

        //文件改名
        public void Rename(string currentFilename, string newFilename)
        {
            try
            {
                FileInfo fileInf = new FileInfo(currentFilename);
                string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
                Connect(uri);//连接
                reqFTP.Method = WebRequestMethods.Ftp.Rename;
                reqFTP.RenameTo = newFilename;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                //Stream ftpStream = response.GetResponseStream();
                //ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message);
            }
        }
        private FtpStatusCode UploadFile(string fileName, string fileNewName, string uploadUrl, string userName, string password)
        {
            Stream requestStream = null;
            FileStream fileStream = null;
            FtpWebResponse uploadResponse = null;
            try
            {
                FtpWebRequest uploadRequest = (FtpWebRequest)WebRequest.Create(uploadUrl);
                uploadRequest.Method = WebRequestMethods.Ftp.UploadFile;

                uploadRequest.Proxy = null;
                NetworkCredential nc = new NetworkCredential();
                nc.UserName = userName;
                nc.Password = password;

                uploadRequest.Credentials = nc; //修改getCredential();错误2


                requestStream = uploadRequest.GetRequestStream();
                fileStream = File.Open(fileName, FileMode.Open);

                byte[] buffer = new byte[1024];
                int bytesRead;
                while (true)
                {
                    bytesRead = fileStream.Read(buffer, 0, buffer.Length);
                    if (bytesRead == 0)
                        break;
                    requestStream.Write(buffer, 0, bytesRead);
                }
                requestStream.Close();

                uploadResponse = (FtpWebResponse)uploadRequest.GetResponse();
                return uploadResponse.StatusCode;

            }
            catch (UriFormatException ex)
            {
            }
            catch (IOException ex)
            {
            }
            catch (WebException ex)
            {
            }
            finally
            {
                if (uploadResponse != null)
                    uploadResponse.Close();
                if (fileStream != null)
                    fileStream.Close();
                if (requestStream != null)
                    requestStream.Close();
            }
            return FtpStatusCode.Undefined;
        }
    }
}
